April 15 in history, these intelligence were sent to the US president

情报历史上的4月15日，这些情报被递交给时任美国总统

Intelligence History on 1963 April 15
Intelligence History on 1964 April 15
Intelligence History on 1965 April 15
Intelligence History on 1966 April 15
Intelligence History on 1967 April 15
Intelligence History on 1968 April 15
Intelligence History on 1969 April 15
Intelligence History on 1970 April 15
Intelligence History on 1971 April 15
Intelligence History on 1972 April 15
Intelligence History on 1974 April 15
Intelligence History on 1975 April 15
Intelligence History on 1976 April 15